A THREE-YEAR-OLD toddler has become a viral internet sensation after her foul-mouthed reaction to having water poured on her head for the Ice Bucket Challenge.

Scarlett-Rose Davis, of Birmingham, asked her grandmother, Carla Davis-Ball, 40, if she could take part in the Motor Neurone Disease fundraiser after seeing one of Mrs Davis-Ball’s friends take part.

“She said: ‘Nanny, can I do that?’” she told the Birmingham Mail. “I wasn’t keen on her having ice water poured over her so I said we’d use warm water from the cooking pot.

“It makes me so happy that a three-year-old picked on a good cause and wanted to get involved. She knows it’s for poorly people.”

Not enjoyable ... Scarlett-Rose Davis has warm water poured over her.Source:Supplied

So her husband, Stuart Ball, 33, filmed it.

Mrs Davis-Ball said she “couldn’t believe it” when the little girl stood up after getting drenched with the water and let out a “f***ing hell.”

Scarlett-Rose Davis

“She has picked up a few bad words when we have gone out for meals or into town,” she said. “It did shock me but she’s so clever I’m not surprised she’s picked it up. We told her it was a naughty word.

“I have to say when I heard her swearing I nearly died with laughter. I know it’s wrong but it’s the same reaction most adults would have after being drenched in ice water,” Mrs Davis-Ball said.

The video has been shared thousands of times since it was posted on Monday. The Ice Bucket Challenge has raised more than $90 million for those suffering with ALS or Motor Neurone Disease. The ALS Foundation collected $2.6 million during the same period last year.

Motor Neurone Disease affects the brain and the spinal cord, causing motor neurones to degenerate and die, leading to gradual paralysis and eventually death.